How to combine variable

[Jerson]

B0 = 1
B1 = 2
B2 = 3



I want C0 = 123
( C0 = B0 B1 B2 )

Try this

C0 = (B0*100)+(B1*10)+B2

or you can do it like this
C0 = B0*10
C0 = (C0+B1)*10
C0 = (C0+B2)

Happy Easter
Jerson